181. Since there are degrees of love and wisdom, there are also degrees of heat and light. By heat and light are meant spiritual heat and light, such as angels in the heavens have, and such as men have as to the interiors of their minds; for men have a heat of love similar to that of the angels, and a similar light of wisdom. In the heavens, such and so much love as the angels have, such and so much is their heat; and the same is true of their light as compared with their wisdom; the reason is, that with them love is in the heat, and wisdom in the light (as was shown above). It is the same with men on earth, with the difference, however, that angels feel that heat and see that light, but men do not, because they are in natural heat and light; and while they are in the natural heat and light spiritual heat is not felt except by a certain enjoyment of love, and spiritual light is not seen except by a perception of truth. Now since man, so long as he is in natural heat and light, knows nothing of the spiritual heat and light within him, and since knowledge of these can be obtained only through experience from the spiritual world, the heat and light in which the angels and their heavens are, shall here be especially spoken of. From this and from no other source can enlightenment on this subject be had.